JP2003297242A - Manufacturing method of plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a plasma display panel which can enhance the contrast of a panel. <P>SOLUTION: A stage in which the under layer film 107 and address electrodes 105 are subsequently formed on the lower substrate 106, a stage in which a dielectric film 108 is formed on those under layer film 107 and the address electrodes 105, a stage in which barrier ribs 109 are formed on the dielectric film 108, and a stage in which fluolescent material layers 104 are formed utilizing an ink jet print method in cell domains are subsequently carried out, and the plasma display panel is manufactured. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plasma display panel, and more particularly, to prevent the phosphor layer from being formed at the tip of the partition wall to improve the contrast of the panel. The present invention relates to a method for manufacturing a plasma display panel that can be manufactured.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a conventional plasma display panel. A conventional plasma display panel includes an upper substrate 101 on which an image is displayed and a lower substrate 10 which is arranged in parallel with the upper substrate 101 with a predetermined distance.
6 and. On the surface of the upper substrate 101 on the lower substrate side, two sustain electrodes 102 are arranged in parallel in one cell region at a predetermined interval. The sustain electrode 102 is a transparent electrode,
It cannot be said that it has better conductivity than metals. Therefore, the bus electrodes 103 made of metal are formed along the widthwise ends of the respective sustain electrodes. A dielectric film 112 is formed on the surface of the substrate so as to cover these electrodes, and a protective film 111 for protecting the dielectric film 112 is formed on the surface.
A base film 107 that reflects visible light is formed on the upper substrate side surface of the lower substrate 106, and then the address electrode 105 is formed.
Are formed at predetermined intervals. The address electrode 105 is 1 for each cell so that it is orthogonal to the direction of the sustain electrode 102.
The book is formed. A dielectric film 108 is formed on the base film 107 so as to cover the address electrodes 105, and partition walls 109 are formed on the dielectric film 108 at regular intervals so as to regulate the width of the cell. The partition wall is for partitioning the cell region and has a predetermined thickness, and the black matrix 1 is provided at the tip thereof.
10 are formed. A phosphor layer 104 having a predetermined thickness is formed on the side surface of the partition wall 109 and the surface of the dielectric film 108 so as to generate visible lights of R, G, and B by ultraviolet rays.

Hereinafter, a method of manufacturing the conventional plasma display panel having the above-described structure will be described.

First, a base film 107 which reflects visible light is formed on one surface of a lower substrate 106 which is a glass substrate. Then, ITO (Indium Tin Oxid) is formed on the base film 107.
e) is coated to form a patterned transparent address electrode 105 having a long shape in a predetermined direction.
The dielectric film 1 is formed on the address electrode 105 and the base film 107.
08 is deposited. A partition wall 109 for partitioning a cell region is formed on the dielectric film 108. A black matrix is formed at the tip of the partition wall 109. The phosphor layer 104 is printed on the surfaces of the partition walls 109, the black matrix, and the dielectric film 108, which are the inner surface of the cell region partitioned by the partition walls 109, by using a screen printing method. When forming the phosphor layer 104 by this screen printing method, first,
The phosphor paste is printed several times so as to fill the inside of the cell region, and then dried at a temperature of 120 to 150 ° C. This process is repeated for each red, green, and blue (R, G, B) cell region corresponding to the hue. Through these steps, the phosphor layer 104 that emits red, green, and blue in each cell region is formed.
After forming, the lower plate is prepared by firing it at 350 to 450 ° C.

Further, the upper substrate 101 has the sustain electrode 102 and the bus electrode 103 formed on one surface thereof, and the sustain electrode 10
2. After forming the dielectric film 112 on the bus electrode 103,
A protective film 11 for protecting the dielectric film 112 on the dielectric film 112.
1 is formed. Generally, the protective film 111 is a film made of MgO. The formation of the protective film 111 completes the preparation of the upper plate.

Next, after connecting the upper plate and the lower plate so that a gas injection port is formed between the upper plate and the lower plate, a discharge gas is injected into the cell region through the injection port. The injected discharge gas is composed of He, Ne and Xe. In this way
The phosphor layer 104 is excited by the ultraviolet rays generated from the discharge gas, and visible light of the hue indicated by the phosphor layer 104 is displayed on the panel.

[0007]

However, the conventional method of forming the phosphor layer using the screen printing method has an advantage that the process equipment is low in price, but the upper portion of the partition wall 109 or the black portion is black. A phosphor layer is easily formed at the tip of the matrix. When the phosphor layer is formed on the tip of the black matrix, the contrast of the panel is lowered. That is, the conventional manufacturing method has a disadvantage that the contrast is lowered.

The present invention has been made in view of the above conventional problems, and during the manufacturing process of the plasma display panel, the phosphor layer is prevented from adhering to the tip portions of the partition walls, and as a result, the contrast of the panel is improved. An object of the present invention is to provide a method for manufacturing a panel that can be improved. At the same time, the phosphor ink droplets are charged to have a predetermined polarity, and at the same time, a voltage having a polarity opposite to the charged state is applied to the address electrodes to prevent the phosphors from being printed on the partition walls. It is an object of the present invention to provide a method for improving the contrast of a panel.

[0009]

In order to achieve such an object, in a method of manufacturing a plasma display panel according to the present invention, a step of sequentially forming a base film and an address electrode on a lower substrate, a step of forming the base film and the address electrode. A step of forming a dielectric film on the electrodes, a step of forming partition walls on the dielectric film to partition the cell region, and a step of forming a phosphor layer on the cell region using an inkjet printing method. It is characterized by having.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In a plasma display manufacturing method according to the present invention, a phosphor layer is formed by using an inkjet printing method. In addition, the droplets of the phosphor ink are charged with a charge of a specific polarity, and the address electrodes have a polarity opposite to that of the droplets so that the charged droplets are printed in the center of the cell area. The direction of ejection of the liquid droplets is induced by charging it with a charge having

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a state in which a phosphor layer is formed in a first embodiment of an inkjet printing apparatus according to the present invention. As shown in the figure, the inkjet printing apparatus includes a phosphor ink 202 including a phosphor and an organic binder, an inkjet head 201 that stores the phosphor ink 202, and an inkjet head 2.
Pressurizing means 20 for pressurizing 01 to eject phosphor ink
9 and a nozzle 203 serving as a passage for ejecting the phosphor ink.

Hereinafter, a method for forming a phosphor layer using the ink jet printing apparatus having the above structure will be described. When the phosphor head is pressed with a predetermined force, the phosphor ink 202 is ejected to the panel through the nozzle 203, and a phosphor layer is formed in the cell area. At this time, the droplet 204 of the phosphor ink has a diameter of about 50 μm. On the other hand, the size of one printed cell area is 200-35.
Since it is about 0 μm, the phosphor layer is less likely to be formed on the black matrix as compared with the screen printing method. Therefore, the contrast is improved.

However, since the ordinary phosphor particles have a large specific gravity and a large size, the uniformity of the phosphor ink is lowered, and fine droplets 205 are scattered in addition to the droplets of the above size. Since the droplet 205 has poor linearity and slow speed as compared with the droplet 204, it has no relation to the ejection direction of the phosphor ink 202 of the inkjet printing apparatus, and is also attached to the tip of the black matrix located on the partition wall. May adhere.

In particular, as shown in FIG.
If the jet direction of 3 and the printed cell area are not properly aligned, the droplet 205 will adhere to the tip of the black matrix. In that case, a color mixture of red, green, and blue will occur on the panel. Even in such a case, according to the second embodiment of the present invention, it is possible to prevent the scattered droplets from adhering between the black and the tip of the lick.

FIG. 3 is a view showing a state in which a phosphor layer is formed by using the device of the second embodiment according to the present invention. As shown, the inkjet printing apparatus includes a first
In the same manner as in the above embodiment, a phosphor ink 402 composed of a phosphor and an organic binder, an inkjet head 401 for storing the phosphor ink 402, and an inkjet head 4
Pressurizing means 40 for pressurizing 01 to eject phosphor ink
9 and a nozzle 403 serving as a passage through which the phosphor ink 402 is ejected, and a charging electrode 406 that further charges the droplet and a droplet that passes through the charging electrode 406 have a predetermined polarity. A first power supply unit 407 that supplies electric charges to the address electrodes 105 and a second power supply unit 408 that supplies electric charges having a polarity opposite to that of the electric charges supplied from the first power supply unit 407 to the address electrodes 105. After being ejected through the nozzle, the phosphor ink 402 is divided into droplets 404 and droplets 405 according to the size of the phosphor ink 402.

Hereinafter, a method of manufacturing a plasma display panel using the ink jet printing apparatus according to the present invention having the above structure will be described. The upper substrate may be the same as the conventional one, and the processing after stacking the lower substrate and the upper substrate does not need to be different from the conventional one.

First, a base film 107 which reflects visible light is formed on a lower substrate 106 which is a glass substrate. Then, the transparent address electrode 105 coated with ITO and patterned is formed on the base film 107. After forming the dielectric film 108 on the upper front surface of the address electrode 105 and the base film 107, the partition wall 109 for partitioning the cell region is formed on the dielectric film 108. At this time, as shown in FIG. 3, the address electrode 105 is formed at the lower center of the cell region.
Position. Then, a black matrix is formed on the partition wall 109.

A phosphor is printed on the inside of the cell region defined by the partition wall 109, the black matrix and the dielectric film 108 by using an ink jet printing method. At this time, the first
When a voltage is supplied from the power supply unit 407 to the charging electrode 406,
The charging electrode 406 is a droplet 40 ejected from the nozzle 403.
Charge 4 to a positive charge. That is, in the present embodiment, the droplet 404 is ejected while being charged with positive charge.
At this time, not only the droplet 404 but also the droplet 405 is in a state of being positively charged.

On the other hand, a negative voltage, which is the opposite of the charged state of the droplet 404 or the droplet 405, is applied to the address electrode 105 from the second power source section 408. In this way, when the ink is charged and a voltage of opposite polarity is applied to the address electrode, an attractive force acts between the address electrode 105 and the droplet 404 or the droplet 405, and the droplet 404 and the droplet 405 are directed toward the address electrode 105. Will proceed toward. Therefore, it is possible to prevent the droplet 405 from being printed on the black matrix. It suffices that the polarities of the charging of the ink and the application of the voltage to the address electrodes are opposite to each other, which is positive and which is negative.

Next, the phosphor paste is printed several times so that the inside of the cell area is completely filled, and this is printed in 120 to 15
Dry at 0 ° C. This kind of process,
For green and blue (R, G, B), the cell region corresponding to the hue is repeated. After the phosphor layer 104 showing red, green, and blue (R, G, B) is formed in each cell region by such a process, the lower plate is prepared by firing at 350 to 450 ° C. To be done.

On the upper substrate, the sustain electrode 102 and the bus electrode 103 are formed, and the sustain electrode 102 and the bus electrode 10 are formed.
A dielectric film 112 is formed so as to cover 3 and a protective film 111 that protects the dielectric film 112 is further formed. Protective film 11
Reference numeral 1 is a film usually made of MgO, and the formation of the protective film 111 completes the preparation of the upper plate.

Finally, after connecting the upper plate and the lower plate so that a gas injection port is formed, a discharge gas is injected into the cell region through the injection port. The discharge gas injected is He, N
e, Xe. The phosphor layer 109 is excited by the ultraviolet rays generated from the discharge gas, and visible light of the hue indicated by each phosphor layer is displayed on the panel.

[0023]

As described above, in the method of manufacturing a plasma display panel according to the present invention, it is possible to improve the contrast of the panel by forming the phosphor layer using the inkjet printing method. effective.

Further, when the droplets of the phosphor ink are charged so as to have a predetermined polarity and at the same time a voltage having a polarity opposite to the charged state is applied to the address electrodes, the phosphors are almost completely deposited on the partition walls. By preventing printing, the contrast of the panel can be further improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an inkjet printing apparatus according to the present invention.

FIG. 2 is a diagram showing a case where the inkjet head is misaligned with a central point of a printed cell area in FIG. 1;

FIG. 3 is a configuration diagram showing a second exemplary embodiment of an inkjet printing apparatus according to the present invention.

FIG. 4 is a sectional view showing a structure of a conventional plasma display panel.

[Explanation of symbols]

401: inkjet head, 402: phosphor ink, 403: nozzle, 409: pressurizing means, 406: charging electrode, 407, 408: power source.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Cho, Yang-jae             South Korea, Seoul, Song Park, Ogun-             Don (no address) Uban apartment             Mento 101-810 (72) Inventor Shion, Ji Hoon             Republic of Korea, Kyunggi de Anyang Dong             Gun-Buk-Hun-Don (no address)             Quanak Dongsung Apartment ·             115-504 (72) Inventor, Bung-jin             South Korea, Seoul, Seochok, Yangjae             -Don (no address), Mihai Chubi             LA 304 F-term (reference) 5C027 AA01 AA05 AA09                 5C028 FF04 FF06 FF08 FF11 FF16                 5C040 FA01 FA04 GB03 GB13 GC19                       GD09 GE09 GF19 GG09 GJ04                       JA08 JA13 KB24 LA17 MA02

Claims (7)

[Claims] 1. A step of sequentially forming a base film and an address electrode on a lower substrate, a step of forming a dielectric film on the base film and the address electrode, and forming a partition on the dielectric film to form a cell region. A method of manufacturing a plasma display panel, comprising: a step of partitioning; and a step of forming a phosphor layer on the partitioned cell region using an inkjet printing method. 2. The step of forming the phosphor layer comprises the steps of charging the phosphor ink ejected from the nozzle to an electric charge having a predetermined polarity, and addressing a voltage having a polarity opposite to the charged state of the phosphor ink. The method for manufacturing a plasma display panel according to claim 1, further comprising the step of applying the voltage to electrodes. 3. The method of manufacturing a plasma display panel according to claim 2, wherein the phosphor ink is charged with a positive charge and a negative voltage is applied to the address electrodes. 4. A method of forming a phosphor layer by using an inkjet printing method, wherein a voltage is supplied from a first power source to a charging electrode, and phosphor ink ejected from a nozzle is positively charged. And a step of applying a negative voltage, which is the opposite of the charged state of the phosphor ink, from the second power source to the address electrode, the method of manufacturing a plasma display panel. 5. A base film and an address electrode are sequentially formed on a lower substrate, a dielectric film is formed on the base film and the address electrode, and a partition is formed on the dielectric film to partition a cell region. A step of forming a phosphor layer on the partitioned cell area by using an inkjet printing method to prepare a lower plate, and forming a sustain electrode and a bus electrode on the upper substrate, and then forming the sustain electrode and the bus electrode. Forming a dielectric film on the upper substrate so as to cover it, and forming a protective film for protecting the dielectric film on the surface of the dielectric film to prepare the upper plate, and forming the upper plate and the lower plate with a gas injection port. And then injecting a discharge gas into the cell region through the injection port, the plasma display panel manufacturing method. 6. The step of forming the phosphor layer to prepare the lower plate is the step of charging the phosphor ink ejected from the nozzle to electric charges having a predetermined polarity, and the step of charging the phosphor ink opposite to the charged state. 6. A method of manufacturing a plasma display panel according to claim 5, further comprising the step of applying a voltage having the polarity of 1 to the address electrodes. 7. The phosphor ink is positively charged,
7. The method of manufacturing a plasma display panel according to claim 6, wherein a negative voltage is applied to the address electrodes.